Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 18, Pages 9008-9014Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402130j
Keywords
stretchable supercapacitor; electropolymerization; buckled structure; polypyrrole; stretchable polymer electrolyte
Funding
- Australian Research Council (ARC) under ARC Centre of Excellence for Electromaterials Science
- CSC scholarship from the Ministry of Education of P. R China
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There has been an emerging interest in stretchable power sources compatible with flexible/wearable electronics. Such power sources must be able to withstand large mechanical strains and still maintain function. Here we report a highly stretchable H3PO4-poly(vinyl alcohol) (PVA) polymer electrolyte obtained by optimizing the polymer molecular weight and its weight ratio to H3PO4 in terms of conductivity and mechanical properties. The electrolyte demonstrates a high conductivity of 3.4 x 10(-3) S cm(-1), and a high fracture strain at 410% elongation. It is mechanically robust with a tensile strength of 2 MPa and a Young's modulus of 1 MPa, and displays a small plastic deformation (5%) after 1000 stretching cycles at 100% strain. A stretchable supercapacitor device has been developed based on buckled polypyrrole electrodes and the polymer electrolyte. The device shows only a small capacitance loss of 5.6% at 30% strain, and can retain 81% of the initial capacitance after 1000 cycles of such stretching.
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